1.average gas mileage between 10 to 12mpg on freeway which is nowhere near what was shown on the sticker. 2.radio not working/locks up, constant system errors, and display screen going black or green at random. 3.mylink system not working correctly, won't take voice commands & shows error messages on screen. The computer will completely lock up & become unresponsive until restart. 4.navigation system screen turns solid grey & locks up at random. 5.backup camera is coming on & the screen then turns black while at freeway speeds in drive, shows error messages. 6.lane departure system not working/detecting drivers side lines on road when crossed. 7.driver and passenger's front seats feel loose at mounting brackets while driving (rocks back and forth). 8.heated/cooled seats not cooling. 9.transmission not shifting correctly, misses gears on acceleration; constant slips & clunks' from powertrain while at road speed. 10.transmission/torque converter won't disengage from engine properly when braking & pushes the truck under engine power, to a stop at random times. The ECM/tcm is having communication errors or problems causing hazardous conditions to present themselves at random unpredictable intervals to drivers. 11.engine misses/stalls when making sharp turns at random: Fails to accelerate when merging into oncoming freeway traffic or turning out of parking lots. Again, the ECM/tcm is having some sort of software communication error which is causing hazardous conditions to present themselves at random unpredictable intervals to drivers. Freeway merging with oncoming traffic or out of a parking lot into oncoming traffic without the ability to accelerate the vehicle is an extremely hazardous condition not only to the passengers of the unresponsive vehicle but to the passengers/drivers in the oncoming traffic. -truck just bought back by GM at our loss.

- Roseville, CA, USA

I started hearing some ticking. And no big deal the next day the motor just vibrated and them stopped accelerating, started rattling. Freaked me out big time, I've only had the vehicle for about 2 months. I'm no mechanic, but this ain't normal. I fear the worst.

- Temple Terrace, FL, USA

I was on my way home from work and traveling between 70-75. The engine began to feel rough. The check engine light was blinking and the traction control light was on. I exited the freeway and called the dealership. They said that it was safe to drive it to them. The engine idled roughly as if it wasn't getting air or gas and would die. As I drove to the dealership it shifted roughly, would only go 55, was shaking violently, and had significant loss of power. The technician said the code was for a miss fire on plug 6. they checked to see if the plug or wires had become loose. They thought it was a valve spring and later decided it was a bent push rod and have disassembled the head to inspect further. They are contacting the engineering dept. At GM to find out what would cause this issue. This is our second truck this year. Our first was a 2014 Silverado 1500 2X4, purchased in may w/ 4000 miles, rolled down a hill on July 26th and crashed into another car while unoccupied, locked and in park. GM was "unable to find anything wrong", and closed our case. The dealership was very helpful and this is our replacement truck. We took a loss but upgraded to the 4X4 because they had already been covered in the recall of June 27, 2014 "in effected vehicles, an electrical signal short may cause the transfer case to shift to neutral with out the driver's input." We haven't even made our first payment.

- Cypress, TX, USA

The vehicle was purchased on August 27th 2014 and had a bad vibration on the drive home. It has a wobble sensation at 35-45 mph felt strongest at 43 mph that feels like it has a bent wheel but it doesnt. When you get to 65-70 mph there is a strong vibration from the truck felt strongest at 68 mph and it only occurs on smooth level roads and even changing lanes does not change the vibration at all so it is not related to the road conditions other then being flat and smooth. The dealer has made five unsuccessful attempts to fix it already and cannot find the problem and cannot fix the problem and has refused to try to fix it anymore. After researching this issue I have found that one out of five GM trucks (Chevy & GMC) have this same issue even though there are not many people reporting this yet. Do not buy or let anyone you know buy a Chevy & GMC truck in the 2014 or 2015 years, 1 in 5 are lemons the vibrations are so bad that it will make you car sick after a few miles and can aggravate existing conditions such as people with back issues. This problem also greatly reduces the trade-in or resale value of the vehicle and will make selling it yourself very problematic if not impossible. If you look on youtube you will see people are starting to post some videos to show this vibration problem.

- Laplace, LA, USA

The contact owns a 2014 Chevrolet Silverado. While driving approximately 30 mph, the vehicle failed to change gears properly. The dealer stated that the failure was normal. The manufacturer was notified of the failure. The vehicle was not repaired. The approximate failure mileage was 2,400.

- San Antonio, TX, USA

Bought a brand new 2014 Chevy Silverado 1500. Rear end shakes badly at highway speeds. Feels unsafe. Dealer unable to effectively diagnose and correct. Problem started first day of ownership approx. 10 miles on truck. Problem still uncorrected and have 2400 miles on truck. ( 2 months ).

- Topsham, ME, USA

This truck was purchased at 8 pm on 9/22/2014. When driving on 9/25/2014, the truck vibrated as though I was driving over rumble strips at approximately 40 mph, 55-75 mph. In hi-2 mode in drive, the transmission did not shift smoothly, shifting with a mild clunk at lower gears. We called the dealership and described the issues to a service person and made an appointment to bring the truck in for service on 9/29/2014. The dealer stated that the problems were probably due to alignment issues. On 9/28/2014, I drove the truck and experienced the same shifting and vibration issues. I pulled off the freeway near my destination and stopped at a light. When I attempted to accelerate from the stop, the truck would not move and "revved". it had switched into neutral without any input from me. The transmission shift lever still indicated that I was in drive mode. I drifted into the intersection, unable to get the truck to move. I was able to shift into park, then neutral, and then drive. The truck began to drive and then I felt a strong "thunk" that felt as though I had been rear-ended by a car going at least 25 mph. The truck then drove normally for approximately 150 feet. I had to stop at the light on the other side of the underpass and the same thing happened again, leaving me drifting into an intersection. I was again able to get the truck going after a minute or so, with the same strong "thunk". I called onstar to have the truck towed to the dealership because it is unsafe to drive. On the four other days that we have owned this truck, it was driven only a few miles each day, at low speeds. I am extremely concerned. The truck is unsafe to drive and has less than 300 miles on it. Additionally, some of the issues I have experienced are similar to those addressed by a recall, but this truck's VIN is not listed in the recall.

- Reseda, CA, USA

Backlash was not setup properly from the factory. I had a loud whining noise from the rear end while cruising around 55 mph. I have had the truck in 4 separate times to fix it. First visit to a dealership refused to work on it. The second dealership replaced the ring and pinion and the axle bearings. This resolved the problem at the original speed but a new sound developed while decelerating from 50 and down to 40. Took the truck back in again and replaced the bearings again. Noise seemed fixed after this fix but the longer I drive it the noise is coming back again at 55 mph. Dealer refused to work on it again saying that its not loud enough to replace the axle but if it gets louder they will replace the axle. Spoke to the dealer where I bought it from and the service manager said this is the 3rd 2014 truck that the bearings and ring/pinion gears had to be replaced with very low miles and with improper backlash setup from the factory. I have a 2014 silver ado with the 5.3L V8, 3.42 limited slip rear end, 2 wheel drive. I have looked into lemon law for the truck but now the dealer is saying that its not loud enough to justify fixing it again.

- North Port, FL, USA

This truck has a vibration at different speeds. I was told by dealer that they are having a problem with 2014 Chevy trucks with the 6 cylinders. The dealer said they are waiting on a fix from General Motors. The 8 cylinders are not having this problem. Is General Motors aware of this?

- New Orleans, LA, USA

Since I purchased this vehicle is has had a vibration from 5-20, 40-50, and 68-78. It has been in the service department 4 times for this problem alone with no resolution. General Motors understands their is an issue with this model truck but does not have a solution. The vibration is felt in the seat, the gas pedal, the steering wheel and the rest of the truck. Tires were indexed, rotated, and balanced, along with the drive line specifications inspected and were found within normal limits even thought vibration persists. Other issues I have had were the exhaust squeaking noises when transferring from V8/V4 mode, in which the entire exhaust system was replaced, water leaking from the sunroof and windshield, frame coating peeling off causing the frame to rust, the seat frame shifting, moving and clicking when turning the vehicle, hd radio loses signal intermittently, radio and HVAC knobs were not lit, headlights were misaligned from the factory, and 4 other recalls such as, overheated exhaust components, unwanted transfer case shift to neutral, peek in odometer display incorrect, and transmission oil cooler connections possibly being bad. This vehicle currently has 6500 miles and has been in the service department a total of 30 days so far.

- Loxahatchee, FL, USA

The contact rented a 2014 Chevrolet Silverado. While in the park position, the vehicle rolled backwards and knocked down the contact. A police report was filed and injuries were sustained. Medical attention was received. The vehicle was returned to the rental office. The manufacturer was not made aware of the failure. The VIN was unavailable. The failure mileage was 1,000.

- Cincinnati, OH, USA

I was towing a trailer utilizing the tow/haul mode, when suddenly the vehicle drastically slowed and the tires squealed and the RPM's went way up. It was like the vehicle suddenly downshifted into low gear by itself.

- Osceola, WI, USA

The contact owns a 2014 Chevrolet Silverado 1500. While driving 3 mph, the vehicle independently shifted into neutral and the brakes and power steering failed. As a result, the contact crashed the vehicle into a light pole. The air bags failed to deploy. There were no injuries. The contact received a recall notice for NHTSA campaign number: 14V374000 (power train) after the crash. The vehicle was not repaired. The failure mileage was 7,000.

- Kingman, AZ, USA

My 2014 Chevy Silverado 1500, ltz, Z71 started to have numerous issues since this past April. The truck has been in the unethical landers mcclarty Chevrolet in huntsville, Alabama seven times with only the smallest of the issues being fixed. 1st issue was the driver side seat moved when turning left or right. The dealer's service department informed me there was no fix and that the seat was within manufactures specs. The seat moved to the point that the ventilated seat cooler plug disconnected. The service dept eventually "fixed" the seat and reconnected the plug. Lastly the issue I cannot get resolved through GM corporate, dealer service department or the regional GM manager. My truck "shakes" from speeds of 65 mph and greater. The service dept first told me I needed an alignment and have the tire rotated and balanced. The shake still continued, so I complained again to the service dept. This time I was told that two tires where "bad" do to road force and replaced them. The truck still shakes like a stripper so I emailed the CEO of GM on 11 July and assigned an executive liaison to work the issue. Since then my truck has been in the service department twice. Each time I was called a liar indirectly by the service department manager "[xxx]" and the district manager "[xxx]" after they test drove the truck and couldn't replicate the complaint. I had the service dept foreman "[xxx]" ride along with me as I drove the truck and pointed out the "very" noticeable shake at high way speeds. After numerous phone calls to the service dept, GM corporate, I found out that the service dept can utilize a vibration analyzer on the truck. This has not taken place or even considered. I continue to drive the truck with the shaking becoming worse with each mile. Just like the ignition switch problem, GM down plays the issue and lets the problem compound. Information redacted pursuant to the Freedom Of Information Act (FOIA), 5 U.S.C. 552(B)(6).

- Meridianville, AL, USA

The contact owns a 2014 Chevrolet Silverado. The contact stated while the vehicle was parked it rolled down a incline and crashed into another vehicle. There was no injuries or a police report. The vehicle was not taken to a dealer. The manufacturer was not made aware of the failure. The failure mileage was 4,000.

- Cypress, TX, USA

Severe vibrations at speeds between 58-70 mph. Vibrations pulsate. Vibrations travel through floor boards steering wheel and gas pedal. Truck was taken to dealership. Tires were rotated and balanced drive shaft was determined to be the problem. New drive shaft was ordered. Drive shaft installed yesterday. The vibrations is worse. Taken back to dealership today. Trip number three truck has only 1400 miles on it. Informed GM. They sent me back to the dealership with no solution.

- Springdale, AR, USA

I'm really disappointed in how my truck is rusting. It has the amount of rust that I would expect to see on a truck after 7 - 10 years. The truck's underbody including the frame is rusting everywhere. For a truck that has only 6,000 miles on it this is ridiculous. Whatever was sprayed on the frame is just peeling off in chunks. I had the dealership in anoka, main motors look at this when I got an oil change today and they agreed the rust is excessive but GM has told them to do nothing about it based on pi0281D. GM claims this is supposed to be the most rust resistant truck ever.

- Brooklyn Park, MN, USA

The contact owns 2014 Chevrolet Silverado. The contact stated that while driving at low speeds, the transmission jumped and surged with out warning. The vehicle was taken to the dealer. The technician stated that what the vehicle was working up to standards. The manufacturer was not notified of the failure. Updated 10/7/14

- Tunnel Hill, GA, USA

When driving at highway speeds between 72 mph +, the vehicle will vibrate very badly to the point where you can not drive so fast. It comes and goes and when it comes back sometimes even at reduced speeds of 65mph the vehicle still vibrates very bad. I have informed GM of my issue and my local dealership and they choose not to do anything. Really, because they don't know what it is. The vibration is so bad that it can numb your body by the end of your drive or distract you enough to crash. I drive up to 9 hours with my vehicle for work and it is very uncomfortable. I am filing this complaint to see if I can get help to stop this issue from happening. A lot of people are also having this problem and from my understanding, GM is ignoring them as well.

- Camden, NJ, USA

The vehicle is shaking on the highway at normal highway speeds. It makes for poor control of the vehicle. It is a brand new Chevrolet Silverado high country. It has been serviced 3 times and the drivetrain has been balanced, the tires replaced, forced balanced the wheels, replaced the tires and still the problem persists. It causes lane wander and does not feel safe at normal speed.

- North Reading , MA, USA